EDSM (Elite Dangerous Star Map) was at first a community effort to store and calculate systems coordinates around the Elite: Dangerous galaxy.
It is now the main API used by dozens of software and websites to find systems, coordinates, information (governement, allegiance, faction...) and celestial bodies (types, materials...).

EDSM has become a must-have for all respectable explorers, and commanders in the galaxy, with it you can:

0.004832% of the galaxy has been discovered on EDSM, it will take 51,333 years, 6 months, 8 days to discover it entirely.
Current known galactic population: 6,632,495,937,032
Current commodities stock in galactic market: 87,447,743,441 t